When a toilet flushes slowly and sluggishly even though there is no complete clog in the trapway, the issue is almost always caused by low water volume in the tank or mineral scale buildup clogging the rim feed holes. If the water level sits too low, the flush lacks the gravitational force needed to trigger rapid siphon suction. Furthermore, calcified rim jets restrict water flow into the bowl. Verification: Adjust the fill valve float upward and clean the rim jets with vinegar to restore normal flush velocity.
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